Double-head screw



FIG. 1 is a perspective view of a double-head screw showing our new design;

FIG. 2 is a side elevational view thereof, all other side elevational views being identical thereto;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a reduced perspective view showing the double-head screw in use; the broken lines depict environmental structure for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a double-head screw, as shown and described. 